146. Firms adopting “profit-related-pay” (PRP) contracts pay wages at levels that vary with the firm’s profits. In the metalworking industry last year, firms with PRP contracts in place showed productivity per worker on average 13 percent higher than that of their competitors who used more traditional contracts. If, on the basis of the evidence above, it is argued that PRP contracts increase worker productivity, which of the following, if true, would most seriously weaken that argument?
(D) Many firms in the metalworking industry have modernized production equipment in the last five years, and most of these introduced PRP contracts at the same time.
不太明白题干, "firms"和"their competitors"难道不应该都属于metalworking industry吗? 如果都属于的话, modernized production equipment 不是应该同时发生在有PRP和没PRP的公司吗?
[此贴子已经被作者于2006-12-29 10:38:39编辑过] |